Size:Approx.7.3x4.5x1.6cmColor:YellowMaterial:Plastic+ABSEasy installation, no tools required. Powered by CR2032 battery, Intelligent light control function - No matter day or night, if you go to a dark place, press any key will light 5 secondsTwo kinds of backlight - Constant backlight: press MODE button for 5 seconds to open, then press 5 seconds to close; Auto backlight: Press any key to light 5 seconds, Durable and water-resistant character can be use in all conditions.

It works well to Measure Speed ,Distance, Riding time and other,which the serious bicyclist or fitness fanatic wants to go with knowing.Description:Size:Approx.7.3x4.5x1.6cmColor:YellowMaterial:Plastic+ABSEasy installation, no tools required. Powered by CR2032 battery, Intelligent light control function - No matter day or night, if you go to a dark place, press any key will light 5 secondsTwo kinds of backlight - Constant backlight: press MODE button for 5 seconds to open, then press 5 seconds to close; Auto backlight: Press any key to light 5 seconds, Durable and water-resistant character can be use in all conditions.Ideal companion for cycling. Can be remote with the line key (17.5cm line), Dual power supply - It can be used by two batteries, increasing the life of the main unit1 Pc Bicycle Speedometer(With Button Battery)Note: Since the size above is measured by hand, the size of the actual item you received could be slightly different from the size above. Meanwhile, please be reminded that due to lighting effects, monitor #39;s brightness / contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item. Your kind understanding will be much appreciated.